While giving Jedi training to Luke Skywalker, Yoda
says: "Size matters not. Look at me. Judge me by my size, do
you? Hmm? Hmm. And well you should not. For my ally is the Force,
and a powerful ally it is. Life creates it, makes it grow. Its
energy surrounds us and binds us. Luminous beings are we, not this
crude matter. You must feel the Force around you; between you, me,
the tree, the rock, everywhere. Yes, even between the land and the
ship." (David K. Miller)

Omniscience, Ubiquity
of Evil

Scene where Luke is on Dagobah learning to use the
Force from Yoda. He ventures in a cave and fights Darth Vader in a vision.
He is horrified to find his own face is that which is hidden by Darth
Vader's mask. (Ted Sherrin)

Spiritual
Discipline/Self-Control

Yoda instructs Luke Skywalker about
the necessity of self-control and discipline when drawing upon The
Force.